The Vespiary

The Hive => Chemicals & Equipment => Topic started by: rookee on April 23, 2002, 09:03:00 AM

Title: copper(II)nitrate*3H2O from copper(II)nitrate???
Post by: rookee on April 23, 2002, 09:03:00 AM: SWIM has some copper(II)nitrate and wants to make some copper-chromate catalyst.
but therefor SWIM needs copper(II)nitrate-trihydrate (rhodium's way). Could he just add the exact amount of H2O to get it or isn't it that simple???
thanks in advance...
greets
rookee
Title: trihydrate
Post by: Rhodium on April 23, 2002, 12:02:00 PM: The commercial copper nitrate is already the trihydrate. Are you sure yours is anhydrous, I don't think so?
Title: What color is your salt?
Post by: Chromic on April 23, 2002, 06:28:00 PM: What color is your salt? The anhydrous inorganic copper salts (ie CuSO4) I've seen are very pale, nearly colorless. The hydrated salts, and copper salts with organic ligands, are usually brilliant colors (eg the emerald color of CuCl2.2H2O, the cobalt blue of CuSO4.5H2O, the blue of Cu(AcAc)2, etc).
Title: it's blue with a slight greenish touch!
Post by: rookee on April 23, 2002, 09:19:00 PM: it's blue with a slight greenish touch!
the whole thing is stucked together in the bottle.
(doesn't look anhydrous).
the bottle says copper(II)nitrate!
so i can just use it as if it would be the trihydrate? ;D
greets
Title: Yep!
Post by: Chromic on April 24, 2002, 12:43:00 AM: Yeah, that sounds exactly like the hydrated salt. A quick way to tell is to take maybe 20mg put it on some foil and heat underneath the foil with a lighter. The hydrated salt will crackle as it loses its water and change color.
Title: You already have the correct one, but I think you ...
Post by: placebo on April 25, 2002, 12:02:00 PM: You already have the correct one, but I think you want to make copper chromite not chromate.
Bored...
Title: oops chromite... yes!
Post by: rookee on April 25, 2002, 10:49:00 PM: yes, copper chromite. sorry :P